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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07842c5eff472d634905c0125ec18f5e1889d4ab1904b4af6770108d3a72e03' 
  AND token = 'beX84sgggKtKwOClYrWU4ttyuO6mi1+g+PZXtFqoeVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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