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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c90be0b1103c8a447f6ac1f7846124a3d2becb306c156c532fc87e43d373d8' 
  AND token = '2vPPSs78MzUatxdjqU3ir6xcDTrIBaX94t1/cyMoVvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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