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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e742e13acc10c6e11c643c2adcee017bd88bebfe30a58b3da522e755af584ee' 
  AND token = 'oWQP9AvcYPOZN7C5L/4xKyYl/02f5XfdfESkzooBoWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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