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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0d07906f1ec5daa79e5bc8b61e47c0951393e814421369998f8d5a659431f8' 
  AND token = 'Vx68K3xb3f1qQBOF9NfCR09RtciGA3Q8o1SMTv77eQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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