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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a34d730875e81b6cfd01fe88d11e721e5ad4ada94c940eb2562321ba04b18ed' 
  AND token = 'XxVd2jpK75kWo8kzsZyB1/jh0k4+T67AFC8v52kFnHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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