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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5091286d2c50c4b6878ee7784c2b9bbf9ecb3d8c8b9ffb6c47aa871b80a0dd9' 
  AND token = 'q4VZryPEhW04AAhJgVQVFOYdPiVWsv+4uo/QgtduzpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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