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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fd2badcc081ca7466304980c3fc392da95c0e5115229f75e1768e8f710a9a6' 
  AND token = 'mTmpMz2xOrsbT6MRmICjCLnzXDqiQZa6ggmZn9xXyH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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