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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8ed619ad8252608fe7ffb3f235e45c0971a38101f3359d50cda7740aa71da9' 
  AND token = '9Yfhg+L89PQnY48gZ8sCu1OZGLte45aMPvaPuK6KLtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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