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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae83671584d2e95af9d9c6e2b5e8e1c287bae82505398a5a0de76110e64eea7' 
  AND token = '84cIzfQJarMWPZL79/jn+w4lupGk07qpLGIFN2tjkIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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