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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29bc0d72d75e71526605820ea94c25c24f6c8fbd0386a6fb0a62db2f892799c' 
  AND token = 'wginpnxnh/I+2yg8ZTOdjQ6YyXeJrxKXwbz6IR6JIS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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