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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffce491bb09fa129fbdfd156d4575b2c12eaa6d4ca5a2a3ac7285495fa843f52' 
  AND token = '8Yv2mBUp5+xvYomVbz65rQ3LET6arap737i0e3okRjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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