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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814b32838680f9005530b8a02ec53464858e3d129744c0fcad0dbdb784b22399' 
  AND token = 'LxHsGoNlePYpqJeXU9jdxKnL/BCqIBpo/1CtVEN6ae4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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