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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc5e3abe62487e96254d40a3886eeb2f75ef363e587cbed52c1b861ae95e316' 
  AND token = 'bp+cn71wJ9yTPfgjprtkhr3YlKgkHAHCB8aMMWOXtJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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