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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4834e77dab410d9abcaf5270b02c060bf67330fd7f8cf98036062054db796165' 
  AND token = 'W2uJhdZ7tNQ7yq8fDCCwzFnIp3u0Z0LpfhW+IowM6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}