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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6695c4e1016121b7b8d3a639e3295245d8be7e4be2fcdb51ff1584380973d5a' 
  AND token = 'UDbhfb4ooQqrkgeDMjoydDClcj3qVm8EP3+/xpcbQqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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