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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cd69ff6c571c095fdb5b41996a2221266416b8d9cdf38d49195e4fbe551429' 
  AND token = '/aH1n4CPtM1cxSN1kbp+mtB6t4sLORJQse6umrY/37A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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