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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871ee4147844f3d14e73205e06ff492157cc7269eb900e9fa9b9c17c9e7bb7d8' 
  AND token = 'vHjdbHe8N5m+rOFpteMC1Jtsy4EZayNim2OEkhyrbPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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