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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c8e8d50dd820b30e305881ca66a6170c83a3a00d74e1547a542b5614f8a330' 
  AND token = '5ZWdcYB7CPjFVj0bgjXJTJ5QuIGlmJr3nw5F+aaAL4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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