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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeffbd577b7e2c9f16d3e7904da1b6df0896d9ba4cc3cc6b598a3a0b4bf556ae' 
  AND token = 'pT/00pq8xATM3+iTMAruiz2WE3UVAO5PMYAQn8lKxdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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