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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5ce0cd2f08e0a9bfe0ce7428e0a159c38279674ba289aa31a6bb4f9329497b' 
  AND token = 'dv/IG3z7ovZjJSjQNKUoMRE/578qBbkmHInXN1/3430=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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