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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b5a7094bbaec1886ad66babbe29adb800b9979e1f6a71d2653799255ee49b7' 
  AND token = 'UYwjDCV5q81yCYDl8i3kaIjgiBCetcEhSAMt2o7A+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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