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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d12fc6ba24e158e80118967b9f8d86a6d42193dd81eca930a6cc9144cbea75' 
  AND token = 'NG1xtYPvEFs86GNg9UXl8kCkJUwZt7yPHh7kk7yoZEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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