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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a8deda62c8a56f0b30d156309cef0f20879caee7c1a68982f511c3612c7c18' 
  AND token = 'BarofOkmnDAUE7FUi3nDW5Za3m/TlS9b2Ddv0L78upc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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