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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c62f9a69860be7294c8d9c8245b9cb3bcf6b6d203e8ead792c67be5cadf3bf4' 
  AND token = 'i5eiQnjcyXT1CvRil+cUVUlpOnuRaLuB3TXIqa042SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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