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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eae1a1ac6566946fd7c641120a031aac0eacd16f0e76989d963c0a6f7458f8f' 
  AND token = 'Gi1dVQdtkbe41ifYO+r4QTyyS4aa1ax4XCuwcUli1eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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