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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fe731e2f116f4542d6166d68318728513d9ee3077e3bffca3279680c48196c' 
  AND token = '0R8VkGVibG7o20q0iBKZiD0Li+aadle7HbHsbRoopVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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