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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb91ceceac648ffe435dd1e10d029daf94ccaca3e98f34c608f2a139d25e84c0' 
  AND token = 'rzfr0/0g390t4Q9HktimCpU67bG9saqTybX5/iJ6Fbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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