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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d2c14c948085017376c3996510a17ca8bbb27fe4b98553f688a5bbb9b63017' 
  AND token = '7j1wttwtZVAvdsVn/10Uxwt8JM9zCH4BTCJK97BxxVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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