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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f4bf320ee43cdfca66b633601b7440315bd053e18884762997f75cce793b94' 
  AND token = 'tQGkZblivt5tUs0huOFsYqFUOwPnld9ztyG7uXOnBr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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