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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90770e7075592e04ad7c306ce8b7fd32cd6354b6fcab2ba593f2bb6386d4b6c9' 
  AND token = 'HJRxQq0QMc7rgRHy1NdY+wyHp1tXth855Rxv9pD6104=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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