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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c99286434158cc9580ab8c9148bec59f6cb14324d8d1e6baa9227ccbae66b7' 
  AND token = 'zeIaeNWu+I4PiA6K1yas5DbBQnMovgACQZNA6tm5my0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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