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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86b18941a7070857483e65f83fb676b478ea3fa4ca86faba9cd0edfa746107f' 
  AND token = 'iCgkjx7NbiIRVxkbdw54QW4hOSpKaRW7qa6tpB9u63w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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