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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f7316f37210ba9e7b0faec9c19aae8fe2f125c8a662f08180d4489af63c0d9' 
  AND token = 'UTVVIEJHeaaBumIafxLc+Z7Nj3nbF7Itd+QUn+xJ/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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