SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d69420e4205d7b30e0830902b56b55c4ab888314d5f936c2ac1d6c554bcd2a' 
  AND token = '0UtXph4G/zZtoikf0aOSocBCR8KJsZkzGECVGkhwgHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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