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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e709b1563d6f3f7e5096a833c8180e4ba18f6bfcf11478b5fd700f2dc26613' 
  AND token = 'KrpxVh1cTNknYQNm24Fz9WGkieIhaKJPV7O/kVLCm4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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