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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8eabad25332c6e83927a02500098615d63bbe49f17eaba8b2ac8888417e3d7' 
  AND token = 'KA4PQWFzFd2e23psXSla7kO2G6DZPc3/4JaIhbOprbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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