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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1286a1a95a00c03563fd5707f1d02c5e891d294c960474d4b4f00e60f44d8a' 
  AND token = '//Xwcjy+gwm3adKpF56LNhnt3dzlsULjocLZ9sxx13Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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