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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4757216de060c089b8cfc38f216a678bf7ba50c95d4fc87b8a1ec182e3cd5d' 
  AND token = '5cXwVMyBeAGVqCQ3sLWlETvoNx3wswmZw3Yfr4stBlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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