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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73267af45d069382ed334f17166dcc58a10e4c3a96fc61ae25960733abd30fa' 
  AND token = 'JPIhSLZAQ8Q7UnjGSZiINhlCAK643iiqyvwjCo63AUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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