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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b13904eee1276deb2141d318a73abca8062a003ee0b08310360b21403daf24e' 
  AND token = 'OG782SeXjjRdHlORZo8y9ErblhhBNMR+JBBRj7M7O4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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