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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ed767f36dada2e4fe1c182484f22fd85f9df02eed213b75d5736c96e1330f1' 
  AND token = '1UqUuMN/t34nagiDUZVraPQj5N00GxeJLePe4HtS97E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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