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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c096fbbde91fcd96d216b0eb96de7a81b7c8f26266a52f86c84e5d4b4d6f9ac' 
  AND token = '2PY7NRTYRNDRvLL29Nj+jZOnTrMhlmEdMdV+o+1WBCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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