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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e548a0ace10a32a99affca14fda3cf32d253fce0c8f7184a4a3f2034a82c91d6' 
  AND token = 'WpPXLB0ktElc4Sjeq3opxcjyFsOwFM4eoEiljQshLIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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