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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73ca8c3d2f4127a633664ae86effbcc6b722f7ec713e2fceaa789d4f84d5d5b' 
  AND token = '8Ex+QWeH8rhxFSsJrrsY0QHOmtU4x3PRSf6UshJjjWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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