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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38f0124e610c0e9ad42d0916724fb9a7691be637509e43ff85b79205283d0bf' 
  AND token = '66WVIapd6ZM40fHJ+dQMyvzGPQJlcwcCQ0JQJJPxtag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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