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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efaa33b365c7d67e24f3862d69e33252a696175cf41149ae4f8ed5579e20ce9' 
  AND token = '94RrvK+pRLTRyYYFov2e+QlhSY8PoHJuQhVXM3NE60Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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