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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa75c8a39ee63385301a1f8758c176fcdac25fa307fa30895d61779452b83af8' 
  AND token = 'wr1AZj0f/jGklB1VBIoHo0dvojf7pBdccAp3WYa4o0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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