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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffff32426c3914195281f682085ed6ab32c24339b1f8c00753eac004f2cf81f5' 
  AND token = 'cw4Xpe7IdQ/LOve/N53SYs9SbUf6uVYEqNQRNurf+7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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