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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d38e30fe3863c308e343685776311cc4ee6590470e6a1c5acbe794d73ecb44' 
  AND token = 'wrss087DcncfJGn89PEbhTrijIO7C0U/mOJ489Kne48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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