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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95627b84a8f5d874f44c9ab5b14e64b6abeded670895423b1802d6af3a9efde' 
  AND token = 'HRrnHpQonqqBYTRIXS13OUicM4s23TO/nA48+6HtZnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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