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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba186424cc26b282504d4015a9be6a46820c91b284386efe85ed2bb14fb87e1a' 
  AND token = '8E2oDOU91b9pB0wIhMOAeESITD6s5uVMimWt/CQm2h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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