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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7970c13294dcb09d4904b7312d7247b998b3c843663c050675bc18b2fc4ad278' 
  AND token = 'BbXdgZUqQ3cGk6jmNBAjmc+huse090Q6bcjb/W8CFO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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