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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7499056e094b401434e098e9a547043e42e3ceac5c434a3518f04f7df802de5b' 
  AND token = 'Tc+0X86oT5Vcr3OtRFwALaV5J9AX0eQqgNDl/mDbEOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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