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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7bc28a8f59a3dedec6e3359ad6a3a52fcf170bc93319b38acc10c57a87f3b5' 
  AND token = '0wxyABLLUX26Fwgx+j+X+HNc9EL3CnA1nFUfiI0xJg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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