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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cdc41ed51a125939b7081f72026845a3e2d4c88eeed1470fdf1a0195bd5264' 
  AND token = 'O5CQK+pzg9ptQFRXLW28/ynQ0qYXvm6rvJvksrT7Ua0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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