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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b4f7f9d1163e089f90539ac1124c2098b72e0d420864bfb28f1c0258edd1ac' 
  AND token = 'EDII+b8+20DTt2ANHDap5IkkN8xygshLxkZD+InoZ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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