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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ab9a8cfbbc9e96438b89e4a6cc57810c0eb2f630751ade35fd33a5023c5981' 
  AND token = 'QapIZ038Ga3br8yGJooTBW4mqiz/9iBzYGbr1z/O2cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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