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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03bd5599928eed783070d79e6589ab58605d0adc2391754f05a55fd7b303d24' 
  AND token = 'v0uJZbgr1nG9O8/mOU0F5GVvL21pP6qvNnSePA3n3QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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