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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe81d0ffbcaefc2165fc1da66b0467152d9a3b4e8a0e212e71a08490dcc93a5' 
  AND token = 'bvjG8W2fuaBFQjK6WN43eNzu5aVp62cP0eLgqx+Gwpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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