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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011b9023a0b976aeb4404066a6871f81d66e6c47f8b57ce68f9908279e15041d' 
  AND token = '8nMP1w2w+u1Tw6Vuya5CPhaSoqKNY8qxr6CnvrrM6Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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