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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce4ec5a6cf6a40dab2dde24fd44def03fdce532b4fd3149ce0bc8395990c9fc' 
  AND token = '20JD6UpeTZZ7qvDWpu+wneZnxkQ67M2uJOilT2/YdaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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