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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ccd50ad9d1a9ebbfc9a071304894db915c1ad8a722d4c0f00e672e473dca29' 
  AND token = '9IjGNCwy7IlpZ7VJkwsztlljVCo2lZ4TlfMCsQkZmuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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