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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb09b151f3432a22b8b4bd6916c6ab617af8b32268103c53af0f93f92f0fc4b' 
  AND token = '5ftfNI7kfgyIiOFTyz45knP9xJ/+d/4ENw6QMCutO4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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