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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b9fbe74ec76d1715dc9207fb27516292e045594d464b8fcd1e8b809309a3e6' 
  AND token = '3nmOTJ/qxeKLW4cj5ms8RSFhHW4XbN66dPd4TCr0GYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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