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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875803a0b60e04db2ceda82c133ceb9031a4f13d19642a23ec7c5acbd1e940ae' 
  AND token = 'kOUsc+X5E5TOO+vVd+4Ime4PVNwTvfDGXhfYvZ4hNRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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