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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d35d5ba465c77aed0ba4fe7c9df1e3d36c516c8d53001b99831754ed7c88ff8' 
  AND token = 'lgoVcQ1pqTU7xH4eAFeJ19shI6ypwC6MhptWRNzFFpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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